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Table 4- .Estimated Water Quality Impacts Associated with Conversion of Existing Watershed Land Uses to Ultimate Land Uses for Lake Owasso, Lake Wabasso, and Snail Lake' Lake Statistic '1997-19992 Future Land Use3 Future Land Use w/o Additional Watershed w/ Add'I. Runoff BMPs Runoff BMPs (@ 40-50% TP Rmvl. Effie) Owasso TP Load (kg/yr.)4 377 412 395 -- 398 L (g/m2/yr.) 0.32 0.34 0.33 -- 0.33 Pspring (!-tg/~-) 34 35 34 -- 34 Psummer (µ9/~-) 30 30 30 -- 30 Chl a (µg/L) 8.6 8.6 8.5 -- 8.5 SD 2.8 2.8 2.8--2.8 P Ex ort Rate k /ha/ r. 0.35 0.38 0.37 -- 0.37 Wabasso TP Load (kg/yr.)3 34 30 27 -- 28 L (g/m2/yr.) 0.51 (0.24)5 0.546 (0.23)5 0.51 (0.20)5 -- 0.51 (0.20)5 Pspring (i-~g/I-) 25 24 23 -- 23 Psummer (!-~9/L) 24 24 22 -- 22 Chl a (µg/L) 6.8 6.7 6.3 -- 6.4 SD 3.1 3.1 3.2 -- 3.2 P Ex ort Rate k /ha/ r. 1.14 1.11 0.91 -- 0.95 Snails TP Load (kg/yr.)3 136 142 139 -- 139 L (g/m2/yr.) 0.3G 0.31 0.3 -- 0.31 Pspring (µ9/~-) 19 19 19 -- 19 Psummer (I-~9/~-) 26 26 26 -- 26 Chl a (µg/L) 7.4 7.4 7.5 -- 7.5 SD 3 3.0 3--3 P Export Rate (kg/ha/yr.) 0.39 0.41 0.4 -- 0.41 Psp,;nq =steady state spring phosphorus concentration (mg/L) L = areal phosphorus load (mg/m2/yr) Rp =phosphorus retention coefficient (Kirschner and billion, 1975) = 0.426 exp (-0.271 qs) -r 0.574 exp (-0.00949 qs) qs = areal water load (m/yr) = O/As O =lake outflow (m3/yr) As =lake surface area (m2) z =lake mean depth (m) p =flushing rate (yr-1 ); number of basin volumes that pass through the lake each year TP Load =Total phosphorus load from the lakes immediate watershed (kg/yr) Psummer =steady state summer phosphorus concentration (mg/L) Chl a = chlorophyll a concentration (mg/L) SD = Secchi disc transparency (m) P Export Rate =phosphorus yield rate form the lakes watershed (kg/ha/yr) z 1997-1999 data entries based on regression relationships between observed data -- TP, Chl a, and SD. s Future land use entries based on calibrated mass balance model predictions that include estimated load changes associated with land use changes. "The change in TP loads from 1997-1999 estimates to future estimates assume no treatment of the runoff from the changed land use occurs prior to entering the respective lake. Therefore the change in TP loads are the maximum that would be expected for the land use changes. s This areal TP loading rate excludes any impact from the water discharged from Lake Owasso to Lake Wabasso. e Water quality modeling computations do account for augmentation pumping from Sucker Lake to Snail Lake P:\23\62\645\Water Quality\Lake WQ Info.xls